We are surrounded by exothermic and endothermic reactions. Episode 29 starts by describing the first law of Thermodynamics (1:39) as well as the terms system and surroundings (1:53) using the combustion of hydrogen as an example. We take a closer look at the bond breaking and bond formation of the combustion (2:20) and describe the energy diagrams for exothermic (2:51) and endothermic reactions (4:12). Hand warmers and cooling packs are great examples of exothermic and endothermic processes (4:47). But also purely physical changes, like water freezing or ice melting can be described as exothermic or endothermic (5:31).Question: In Chemistry, we use Enthalpy as a measurement of heat content. What is the sign for enthalpy for an endothermic reaction?Thank you for listening to The APsolute RecAP: Chemistry Edition!(AP is a registered trademark of the College Board and is not affiliated with The APsolute RecAP. Copyright 2020 - The APsolute RecAP, LLC. All rights reserved.)Website:www.theapsoluterecap.comEMAIL:TheAPsoluteRecAP@gmail.comFollow Us:INSTAGRAMTWITTERFACEBOOKYOUTUBE